factorise 4a^2-12a-216
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Answer a-9 and a-(-6)
'-' this refers to is equal to
Step-by-step explanation:
4a square- 12a-216
4(a square-3a -54)
a square- (9-6)a- 54
a square- 9a +6a- 54
a(a-9) +6(a-9)
(a-9) (a+6)
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